Abstract: In a method and an apparatus for sampling gas for analysis purposes from a hot dust-filled gas stream, e.g. smoke gases from industrial plants, the sampling is carried out continuously using a gas sampling probe without the use of a coolant, said probe comprising a gas inlet section (1), a filter section (8) and a gas outlet section (9) connected to a gas pump (6), and wherein the filter section (8) is embedded in a filter housing (3) with an outlet (4) for the purified sample gas portion to be analyzed, and the probe being furthermore provided with a dust activation device (5) which activates the dust particles suspended in the gas in such a manner that the particles are constantly prevented from depositing or forming bakings in the interior of the probe and thus clogging it.

Abstract: There is disclosed a method and apparatus for sampling gas from a hot dust-filled gas stream using a gas probe so arranged as to protrude into a gas- and dust-filled atmosphere, wherein the probe samples a gas portion of said gas stream, wherein the sample gas portion is sucked through the probe by a gas pump connected to the probe, and wherein at least a portion of the sample gas portion is first separated from suspended impurities and then fed to an analysis apparatus. The method and apparatus are further characterized in that the clogging or forming of bakings in the probe of dust suspended in the sample gas portion is prevented by activating said dust in the probe by means of a dust activation device comprising at least one of a laser emitter or means for deionization of the dust particles prior to filtration of the sample in the probe.

Abstract: Equipment for monitoring the concentration of components in a gas flow has two probes (1,2) located at (63) in the gas flow. Sample gas is drawn through the probes and through pipes (3,4) by a pump (8), and test samples are extracted from the pipes by pumps (11,12) and fed to an analysis line (10). The probes (1,2) work alternately, and, when one is not working, it may be cleaned by blowing air through from a source (9), while the corresponding one of the pipes (3,4) is blocked from the line (10) by valves (13-16).

Abstract: A probe for taking a sample of dusty gas has a duct (2) with a cooling mantle (11) and leading to a compartment (4) with a filter (5). The duct inlet (1) is convergent to reduce gas velocity and hence dust entrainment.